SOLUTION: Fred has built a rectangular sandbox with a perimeter of 48 feet and a length that is twice its width. The sides of the sandbox are 18 inches high. Fred wants to fill the sandbox

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Question 802234: Fred has built a rectangular sandbox with a perimeter of 48 feet and a length that is twice its width. The sides of the sandbox are 18 inches high. Fred wants to fill the sandbox to 75% capacity. He owns a wheelbarrow, which carries a load of 5 cubic feet of sand. How many trips will he need to make with the wheelbarrow from the sand pile to his sand box?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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Write an equation for each statement
:
Fred has built a rectangular sandbox with a perimeter of 48 feet
2L + 2W = 48
simplify, divide both sides by 2
L + W = 24
and a length that is twice its width.
L = 2W
then
2W + W = 24
3W = 24
W = 8 ft is the width
and
L = 2(8)
L = 16 ft is the length
:
The sides of the sandbox are 18 inches high.
Fred wants to fill the sandbox to 75% capacity.
Find the height of the sand in ft (18" = 1.5 ft)
.75*1.5 = 1.125 ft
;
Find volume of the sand
V = 16 * 8 * 1.125
V = 144 cu/ft of sand
:
He owns a wheelbarrow, which carries a load of 5 cubic feet of sand.
How many trips will he need to make with the wheelbarrow from the sand pile to his sand box?
144%2F5 = 28.8 ~ 29 wheelbarrow loads required